JPS609580A - Automatic welder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic welding device for automatically welding continuous and complex contours, and the invention relates to an automatic welding device for automatically welding continuous and complex contours.
Alternatively, it can be applied to welding workpieces having joint parts consisting of circular parts in different orders.

The device for welding along complex contours has a circular track on which a known welding wheel is mounted. A welding torch is attached to a welding vehicle. The circular track is fixedly attached to the second welding wheel.
The welding car is installed on a straight track.

Such known devices include the inability to weld along curved contours with small or medium-sized radii, since the minimum turning radius of the welding torch is limited by the radius of the trajectory and the capacity of the welding vehicle. In addition, since the length of the straight track is limited by the bending radius of the circular track, there is a problem that only a limited straight length can be welded.

Other known devices include two cylinders with attached beams to which a first carriage is attached. The first reciprocating table has a bearing nest in which a cylindrical roller is mounted. A box is fixed to the first moving table, and a motor reduction unit having a DC motor and gears is fixed to the shaft of the box.

A rack gear is attached to the beam, and a gear is always meshed with the rack gear.The cylindrical roller is connected to the beam by a flat guide welded to the beam. A second beam equipped with a similar device is attached to the side of the beam on the first reciprocating table. What about the two-beam double-pillar doubling table? interconnected at the root. A bearing box is attached to the second beam, and this bearing box has D
A shaft is mounted so as to be driven by an electric motor C, and a welding torch is attached to this shaft.

This device has the drawback that its design is extremely complicated and the number of parts is large. Furthermore, in order to maintain a constant circumferential speed in straight and circular welding areas, the rotation speeds of the electric motors are different, so there is a problem in that the speeds of the motors must be matched by 19 degrees. moreover,
In order to weld along complex contours, different electric motors are used to start and stop the machine, making it impossible for the machine to move using its own blade. Then, if the welding zone is only in one direction, the electric motor must be capable of forward and reverse rotation to achieve linear motion, or if the welding zone is in two directions, all electric motors must be capable of forward and backward movement. There is a problem that requires reversibility.

The object of the present invention is to provide a simple structure capable of accurately guiding a welding torch at a constant speed along a predetermined complex contour consisting of straight lines and curved sections or sections of curved sections of different orders. Moreover, it is an object of the present invention to provide an automatic welding device that can maintain a constant angle between the torch axis and the vertical line of the welding contour at all welding points.

This purpose includes first and second carriages each having a welding torch attached to a pair of first and second guides;
This is achieved by an automatic welding device equipped with a drive unit and a rack gear in which gears are constantly engaged. According to this invention, the first and second reciprocating carriages are respectively attached to the first and second drive screws, and the first and second drive screws are connected to the drive unit by the selection switching mechanism. is connected to. The rack gear is mounted on the first carriage and the gear is mounted on a shaft mounted in a bearing box that is rigidly mounted on the second carriage. A welding torch is fixed to the shaft.

The welding device of the present invention has the following advantages.

This device is capable of performing both butt and fillet welds on both straight and circular closed or open profiles. The device does not require forward and reverse rotation even when the direction of movement of the welding torch is changed and can be configured with one electric motor. The welding torch is reliably guided by a pair of rack gears and gears, and at all welding speeds and points,
The angle between the torch axis and the vertical of the weld zone can be kept constant by two drive screws. Due to the simple chain structure, quick resets can be made for different weld geometries.

Embodiments of the present invention will be described below based on the drawings.

The automatic welding device includes a drive unit 1 consisting of, for example, a motor and a speed reducer, and this drive unit 1 has a selection switching mechanism 2.
is connected to. This selection switching mechanism 2 has a drive shaft 3, and this drive shaft 3 has a gear 4, which is meshed with gears 6 and 7.
5 are attached to each. The gears 6 and 7 are fitted onto the intermediate shaft, and the gear 8 is arranged on the intermediate shaft between these gears 6 and 7. The intermediate shaft has three intermediate shafts arranged coaxially, and these three intermediate shafts are connected to electromagnetic connectors 9,
10 are interconnected. The gear 8 is meshed with a gear 12 attached to a shaft 13, and the shaft 13 is connected to a first drive screw 15 by an electromagnetic connector 14. A first reciprocating table 16 is attached to the first drive screw 15. The first reciprocating table 16 is fixed to a pair of first guides 12.

The gear 12 meshes with the gear 18, and the shaft 19 of this gear 18
is connected to the second drive screw 2 by an electromagnetic connector 20. This second drive screw 21 has a second reciprocating table 22.
are connected to each other, and this second reciprocating table 22 is fixed to a pair of second guides 23. A rack gear 24 is fixed to the first reciprocating table 16, and a vertical shaft 22 is attached to the rack gear 24.
A gear 25 attached to 6 is always meshed. A bearing box 27 is attached to the second reciprocating table 22, and the vertical shaft 26 is supported by this bearing box 27. A welding torch 29 is attached to the lower end of this vertical shaft 26 via a bracket 28 and a twist connection.

Next, the operation of such an automatic welding device will be explained.

The driving force of the drive unit 1 is transmitted to the gears 8, 12 and 15 via the gears 5, 6 or 4, 11, 7 by the switching action of the electromagnetic connectors 9, 10. 1st and 2nd
When the drive screws 15 and 2 are connected by the switching operation of the electromagnetic connector 14.2'0, the driving force is transmitted only to the first drive screw 15, and the first reciprocating carriage 16 is also transferred. Driven. This produces a translational movement relative to a rotational movement. When the electromagnetic connector 20 is switched on, the second drive screw 21 and the second reciprocating carriage 22 are respectively driven. When the electromagnetic connectors 14, 20 are switched on at the same time, the first and second drive screws 15 and 2, the first
And the second reciprocating carriages 16 and 22 are driven simultaneously.

In this case, the rack gear 24 and gear 25 are moved translationally at the welding speed without any relative movement between them. When the first drive screw 15 is driven independently, its translational motion is transmitted only to the rack gear 24 that is always meshed with both wheels 25, so the gear 25 is moved circularly and at the same time is not translated. In this way, the welding torch 29 moves around the circular area to be welded.

If the gear 25 is replaced with a gear having a pitch circle radius equal to the radius of the circular welding area, the first and second drive screws 1
5 and 21 can be applied to circular welded areas with different diameters, and in this way constant welding speeds can be obtained for both circular and linear welded areas. The switching order of the electromagnetic connectors 9, 10, 14 and 2θ is programmed in advance depending on the order and length of the straight and curved welded areas.

More complex welding areas (geometry) can be covered if the automatic welding equipment is mounted on an intermittent conveyor that moves in predetermined steps in a direction perpendicular to the basic linear welding motion of the welding torch. .

The device can also be applied to cutting, assembly and facing etc. if the welding torch 29 is replaced by a suitable torch for cutting, assembly or facing.

[Brief explanation of the drawing]

The drawing is a schematic diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Drive unit, 2... Selection switching mechanism, 16.
...First reciprocating table, 17...First guide, 22...
Second reciprocating table, 23... Second guide, 24... Rack gear, 25... Gear, 26... Vertical shaft, 27...
・Bearing box, 29...Welding torch.

Claims (1)

[Claims] An automatic welding device comprising first and second reciprocating tables each having a welding torch provided on a pair of first and second guides, a drive unit, and a rack gear that is constantly meshed with a gear. The first and second reciprocating carriages are respectively attached to first and second drive screws connected to the drive unit via a selection switching mechanism, and the rack gear is attached to the first and second drive screws, respectively.
while being fixed to the reciprocating platform, the gear is mounted on a vertical shaft mounted in a bearing box fixed to the second reciprocating plow platform;
An automatic welding device characterized in that a welding torch is attached to the vertical shaft.